Device for driving an electromagnetic pump and related electromagnetic dosing pump
An electromagnet and dosage technology, which is applied in the field of electromagnet devices, can solve the problems of uneven metering concentration, high cost, and inability to install in pumps, etc.
Active Publication Date: 2008-07-23
赛科波诺伊格塞格塔股份公司
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Problems solved by technology
[0008] However, such a solution has the disadvantage that the consequence of reducing the number of strokes that all reach the stop of the piston is that the metered concentration in this time unit is significantly inhomogeneous.
[0012] However, such a solution has the disadvantage that the adjustment device is extremely complex and expensive, since it requires very complex and extremely precise sensors, taking into account that the strokes involved are usually of the order of one or two millimeters, and due to the reduced space, it is almost impossible to install them in the pump
As a result, sensors to sense the operating pressure applied outside the pump are also required, making the regulator more complex and expensive
Method used
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[0051] The inventors have developed a variable-capacity driving device for driving an electromagnet operating a pump, based on sampling of the curve of the current applied to the electromagnet, by searching for characteristic points of the current curve along time, using only Electronic detection of piston stop. Such detection becomes more accurate as the number of sampled values within a time unit increases.
[0052] Specifically, referring to Fig. 2, it can be seen that the curve of the current over time flowing through the electromagnet (the piston of which is initially held by the coaxial spring load) roughly includes three parts: the first part C1, from t 0 (the moment when the driving device starts to make the current i(t) flow through the electromagnet) until t P (moment at which the current i(t) finally overcomes the initial resistance of the spring load), where the piston and cover remain stationary; the second part C2, from t P (moment when the piston starts to m...
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A device and method are disclosed for driving an electromagnet for operating a pump. The electromagnet includes a primary winding and a moving element that is attracted within the primary winding when an energizing current is higher than a first threshold value. The moving element lets a liquid dose into an external hydraulic circuit depending on the a travel of the moving element. A control logic unit detects an energizing current to provide the energizing current to the primary winding until the energizing current assumes a second threshold value, depending on a value of the liquid dose to let into the external hydraulic circuit. The second threshold value is higher than the first threshold value and not higher than a third threshold value in correspondence of which the moving element arrives at a stop.
Description
technical field [0001] The present invention relates to a device for driving an electromagnet for operating a pump, such as a pump for metering liquids, which can be regulated in a simple, reliable, efficient, precise and inexpensive manner in conjunction with the electromagnetic The capacity of the cover is integrated with moving parts of iron, without the aid of position sensors or calibrated electromechanical devices, allowing precise control of capacity as the pressure applied by the external hydraulic circuit outside the pump changes. [0002] The invention also relates to a corresponding metering solenoid pump provided with such a drive, and to a method of driving the solenoid. Background technique [0003] It is known to employ electromagnetic pumps to add liquids such as cleaning agents, sanitizers and disinfectants to aqueous solutions in predetermined doses which are repeatable in time. [0004] Specifically, the liquid is dosed into the solution by the mechanical...
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IPC IPC(8): F04B17/04F04B49/06F04B13/00
CPCF04B17/04F04B43/04F04B49/06F04B2203/0401
Inventor S·利沃提
Owner 赛科波诺伊格塞格塔股份公司